diff options
author | Sean Christopherson <sean.j.christopherson@intel.com> | 2019-08-27 23:40:30 +0200 |
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committer | Paolo Bonzini <pbonzini@redhat.com> | 2019-09-24 14:30:42 +0200 |
commit | a6c6ed1e81060e110258dbc7118fda07e9971e48 (patch) | |
tree | f41ba64d257449f8a77369b0ca0b2f93034994b0 /arch/x86/kvm/vmx/vmx.c | |
parent | KVM: x86: Refactor kvm_vcpu_do_singlestep() to remove out param (diff) | |
download | linux-a6c6ed1e81060e110258dbc7118fda07e9971e48.tar.xz linux-a6c6ed1e81060e110258dbc7118fda07e9971e48.zip |
KVM: x86: Don't attempt VMWare emulation on #GP with non-zero error code
The VMware backdoor hooks #GP faults on IN{S}, OUT{S}, and RDPMC, none
of which generate a non-zero error code for their #GP. Re-injecting #GP
instead of attempting emulation on a non-zero error code will allow a
future patch to move #GP injection (for emulation failure) into
kvm_emulate_instruction() without having to plumb in the error code.
Reviewed-and-tested-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Reviewed-by: Liran Alon <liran.alon@oracle.com>
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to '')
-rw-r--r-- | arch/x86/kvm/vmx/vmx.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c index 8f61250fc1c0..d1bac3cb2440 100644 --- a/arch/x86/kvm/vmx/vmx.c +++ b/arch/x86/kvm/vmx/vmx.c @@ -4539,12 +4539,22 @@ static int handle_exception_nmi(struct kvm_vcpu *vcpu) if (!vmx->rmode.vm86_active && is_gp_fault(intr_info)) { WARN_ON_ONCE(!enable_vmware_backdoor); + + /* + * VMware backdoor emulation on #GP interception only handles + * IN{S}, OUT{S}, and RDPMC, none of which generate a non-zero + * error code on #GP. + */ + if (error_code) { + kvm_queue_exception_e(vcpu, GP_VECTOR, error_code); + return 1; + } er = kvm_emulate_instruction(vcpu, EMULTYPE_VMWARE | EMULTYPE_NO_UD_ON_FAIL); if (er == EMULATE_USER_EXIT) return 0; else if (er != EMULATE_DONE) - kvm_queue_exception_e(vcpu, GP_VECTOR, error_code); + kvm_queue_exception_e(vcpu, GP_VECTOR, 0); return 1; } |